Based only on random conversations and no serious interrogation of what happened, so take it for the very little this pure statement of opinion is worth, I'd say he has, chiefly, and in my own words, a reputation for being a prickly drama queen.

He has never been that to me; I've had just a few personal interactions with him, and they've been uniformly positive. My feeling is that he was generous with his time and expertise when I had questions, and pleasant and welcoming in person.

He has, in the intervening years, done several things that grossed me the fuck out, though. There are certainly people who revel in hating the guy. I'm not one of them.